I so agree. The whole impact of the movie was that you fell in love with the idea of Jack and Rose as a couple and the fact that they became so close on so many levels. And just when they had fought sooooo hard and made it so far, she still lost him. And since you had been pulling for them so hard to make it and wanting them to work out as a couple that beat the odds, your heart was broken when she lost him. And multiply that emotion by all of the other people that died and you can't even fathom the hurts and losses. You would not have respected that deep loss if he had survived. He had to die so you would understand what it all truly meant. A sequel would ruin all of that and be pointless.